int FileTransferProtocol::recvFilename(net::Socket &s, string &filename) {
int bytes_received;
// First, receive the filename size (3 bytes ascii-encoded unsigned integer)
char buf[3];
bytes_received = s.recv(buf, 3, 0);
if (bytes_received == SOCKET_ERROR || bytes_received != 3) {
onTransferError("Could not receive filename header size!");
return -1;
}
// Try to parse what we have received
size_t len;
if (EOF == sscanf_s(buf, "%3lu", &len)) {
onTransferError("Could not parse filename header size!");
return -1;
}
// Finally, allocate a string and receive the filename
char *nameBuf = (char*)malloc(len + 1);
nameBuf[len] = '\0';
bytes_received = s.recv(nameBuf, len, 0);
if (bytes_received == SOCKET_ERROR || bytes_received != len) {
free(nameBuf);
onTransferError("Could not receive filename header!");
}
filename = string(nameBuf);
free(nameBuf);
return 0;
}
int FileTransferProtocol::sendFilename(net::Socket &s, string filename) {
int bytes_sent;
char fNameHeader[4];
sprintf_s(fNameHeader, "%03lu", (unsigned long)filename.size());
bytes_sent = s.send(fNameHeader, 3, 0);
if (bytes_sent == SOCKET_ERROR || bytes_sent != 3) {
onTransferError("Could not send filename size");
return -1;
}
bytes_sent = s.send(filename.c_str(), filename.size(), 0);
if (bytes_sent == SOCKET_ERROR || bytes_sent != filename.size()) {
onTransferError("Could not send filename");
return -1;
}
return 0;
}
void Server::onSocketRecv(net::Socket& socket, const MutableBuffer& buffer,
const net::Address& peerAddress)
{
TraceL << "Data received: " << buffer.size() << endl;
stun::Message message;
char* buf = bufferCast<char*>(buffer);
std::size_t len = buffer.size();
std::size_t nread = 0;
while (len > 0 && (nread = message.read(constBuffer(buf, len))) > 0) {
if (message.classType() == stun::Message::Request ||
message.classType() == stun::Message::Indication) {
Request request(message, socket.transport(), socket.address(),
peerAddress);
// TODO: Only authenticate stun::Message::Request types
handleRequest(request,
_observer.authenticateRequest(this, request));
} else {
assert(0 && "unknown request type");
}
buf += nread;
len -= nread;
}
if (len == buffer.size())
WarnL << "Non STUN packet received" << std::endl;
#if 0
stun::Message message;
if (message.read(constBuffer(packet.data(), packet.size()))) {
assert(message.state() == stun::Message::Request);
Request request(*info->socket, message, info->socket->address(), info->peerAddress);
AuthenticationState state = _observer.authenticateRequest(this, request);
handleRequest(request, state);
}
else
#endif
}
void Server::onTCPSocketClosed(net::Socket& socket)
{
TraceL << "TCP socket closed" << endl;
releaseTCPSocket(&socket);
}
int FileTransferProtocol::sendCommand(net::Socket &s, char command) {
int bytes_sent = s.send(&command, 1, 0);
if (bytes_sent == SOCKET_ERROR || bytes_sent != 1) {
onTransferError("Could not send command!");
return -1;
}
return 0;
}
int FileTransferProtocol::sendErr(net::Socket &s) {
char buf[3] = { 'E', 'R', 'R' };
int bytes_sent = s.send(buf, 3, 0);
if (bytes_sent == SOCKET_ERROR || bytes_sent != 3) {
onTransferError("Could not send error notice to client!");
return -1;
}
return 0;
}
int FileTransferProtocol::waitForAck(net::Socket &s, string errmsg) {
char ackbuf[4] = " "; // Either ACK or ERR
int bytes_received = s.recv(ackbuf, 3, 0);
if (bytes_received == SOCKET_ERROR || bytes_received != 3 || strcmp(ackbuf, "ERR") == 0) {
onTransferError(errmsg);
return -1;
}
return 0;
}
int FileTransferProtocol::sendAck(net::Socket &s) {
char buf[3] = { 'A', 'C', 'K' };
int bytes_sent = s.send(buf, 3, 0);
if (bytes_sent == SOCKET_ERROR || bytes_sent != 3) {
onTransferError("Could not acknowledge client!");
return -1;
}
return 0;
}
namespace Network {
Net::Socket serverSocket;
void cleanUp() {
Net::cleanup();
}
void init() {
Net::startup();
serverSocket.listenIPv4(30001);
}
}
bool accept_client(net::Socket remote, std::string origin)
{
/*
printf("Verifying origin: \"%s\"\n"
"Verifying remote: \"%s\"\n",
origin.c_str(), remote.to_string().c_str());
*/
(void) origin;
return remote.address() == net::ip4::Addr(10,0,0,1);
}
void checkResponse(net::Socket& socket) throw (Exception)
{
iostream::XdrInputStream& istream = socket.getXdrInputStream();
int responseType = 0;
istream.read(responseType);
if (responseType == net::MessageProtocol::ERROR) {
throw Exception("Exception has occurred");
} else if (responseType != net::MessageProtocol::REPLY) {
throw Exception("Internal implementation error");
}
}
void checkResponse(net::Socket& socket) throw (Exception)
{
iostream::XdrInputStream& istream = socket.getXdrInputStream();
int responseType = 0;
istream.read(responseType);
if (responseType == net::MessageProtocol::ERROR) {
throw Exception();
} else if (responseType != net::MessageProtocol::REPLY) {
throw Exception();
}
}
size_t StreamSocketReceiver::receiveHeader(net::Socket &s)
{
char buf[20];
size_t bytes_received;
if (bytes_received = s.recv(buf, 20) != 20) {
throw IncompleteReceiveException(bytes_received, 20);
}
// Try to parse length of payload in header
size_t len;
if (EOF == sscanf_s(buf, "%20lu", &len)) {
throw UnparseableHeaderException(buf);
}
return len;
}
int FileTransferProtocol::recvCommand(net::Socket &s, char &command) {
char d;
int bytes_received;
bytes_received = s.recv(&d, 1, 0);
if (bytes_received == SOCKET_ERROR || bytes_received != 1) {
onTransferError("Could not receive direction from client!");
return -1;
}
if (d != 'D' && d != 'U' && d != 'L' && d != 'Q') {
onTransferError("Client sent invalid direction!");
return -1;
}
command = d;
return 0;
}
void init(string ip, unsigned short _port) {
Net::startup();
try {
socketClient.connectIPv4(ip, _port);
}
catch (...) {
DebugError("Cannot connect to the server!");
return;
}
threadRun = true;
mutex = MutexCreate();
t = ThreadCreate(networkThread, NULL);
}
void StreamSocketReceiver::receivePayload(net::Socket &s, ostream &stream, size_t len)
{
void *buf = malloc(this->packet_size);
size_t bytes_read = 0;
while (bytes_read < len) {
size_t exp_bytes = min(this->packet_size, len - bytes_read);
size_t bytes_recv = s.recv((char*)buf, exp_bytes);
if (bytes_recv != exp_bytes) {
free(buf);
throw IncompleteReceiveException(bytes_read + bytes_recv, len);
}
bytes_read += bytes_recv;
stream.write((char*)buf, bytes_recv);
}
free(buf);
}
namespace Network {
Net::Socket socketClient;
Thread_t t;
Mutex_t mutex;
std::queue<Request> reqs;
bool threadRun = true;
void init(string ip, unsigned short _port) {
Net::startup();
try {
socketClient.connectIPv4(ip, _port);
}
catch (...) {
DebugError("Cannot connect to the server!");
return;
}
threadRun = true;
mutex = MutexCreate();
t = ThreadCreate(networkThread, NULL);
}
int getRequestCount() { return reqs.size(); }
Net::Socket& getClientSocket() { return socketClient; }
ThreadFunc networkThread(void *) {
while (true) {
MutexLock(mutex);
if (!threadRun) {
MutexUnlock(mutex);
break;
}
if (reqs.empty()) {
MutexUnlock(mutex);
continue;
}
Request& r = reqs.front();
//if (r._signal == PLAYER_PACKET_SEND && ((PlayerPacket*)r._dataSend)->onlineID != player::onlineID)
// cout << "[ERROR]WTF!!!" << endl;
if (r._dataSend != nullptr && r._dataLen != 0) {
Net::Buffer buffer(r._dataLen + sizeof(int) * 2);
int len = r._dataLen + sizeof(int);
buffer.write((void*)&len, sizeof(int));
buffer.write((void*)&r._signal, sizeof(int));
buffer.write((void*)r._dataSend, r._dataLen);
getClientSocket().send(buffer);
}
else {
Net::Buffer buffer(sizeof(int) * 2);
int len = sizeof(int);
buffer.write((void*)&len, sizeof(int));
buffer.write((void*)&r._signal, sizeof(int));
getClientSocket().send(buffer);
}
if (r._callback) { //判断有无回调函数
auto callback = r._callback;
MutexUnlock(mutex);
int len = getClientSocket().recvInt(); //获得数据长度
Net::Buffer buffer(len);
getClientSocket().recv(buffer, Net::BufferConditionExactLength(len));
if (len > 0) callback(buffer.getData(), len); //调用回调函数
MutexLock(mutex);
}
reqs.pop();
MutexUnlock(mutex);
}
return 0;
}
void pushRequest(Request& r) {
if (reqs.size() + 1 > networkRequestMax) { //超过请求队列长度，试图精简队列
if (!reqs.front().isImportant()) reqs.pop();
}
if (reqs.size() + 1 > networkRequestMax * 2) { //大量超过请求队列长度，只保留重要请求
std::queue<Request> q;
while (reqs.size() != 0) {
if (reqs.front().isImportant()) q.push(reqs.front());
reqs.pop();
}
reqs = q;
}
reqs.push(r);
}
void cleanUp() {
threadRun = false;
ThreadWait(t);
ThreadDestroy(t);
MutexDestroy(mutex);
getClientSocket().close();
Net::cleanup();
}
}
void init() {
Net::startup();
serverSocket.listenIPv4(30001);
}
